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Journal of Thermal Science

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2023 , Vol. 32 >Issue 2: 770 - 785

DOI: https://doi.org/10.1007/s11630-023-1750-x

Hybrid Slot-Groove Casing Treatment for Stall Margin Improvement on an Axial Flow Compressor with Circumferential Total Pressure Distortion

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  • 1. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. Key Laboratory of Advanced Energy and Power, Chinese Academy of Sciences, Beijing 100190, China
    3. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China 
    4. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-11-28

基金资助

The authors gratefully acknowledge for the support of the grants of National Natural Science Foundation of China (No. 51922098, No. 51636001 and No. 51790510), and the National Science and Technology Major Project (2017-II-0005-0018, 2017-II-0004-0017). The authors also thank the Special Fund for the Member of Youth Innovation Promotion Association of CAS (2018173).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Hybrid Slot-Groove Casing Treatment for Stall Margin Improvement on an Axial Flow Compressor with Circumferential Total Pressure Distortion

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  • 1. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. Key Laboratory of Advanced Energy and Power, Chinese Academy of Sciences, Beijing 100190, China
    3. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China 
    4. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-11-28

Supported by

The authors gratefully acknowledge for the support of the grants of National Natural Science Foundation of China (No. 51922098, No. 51636001 and No. 51790510), and the National Science and Technology Major Project (2017-II-0005-0018, 2017-II-0004-0017). The authors also thank the Special Fund for the Member of Youth Innovation Promotion Association of CAS (2018173).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

本文以低速单转子压气机为研究载体，在周向畸变条件下对前缝后槽机匣处理的扩稳效果进行了实验研究。该型机匣处理的设计考虑了失速裕度提升和效率损失的折衷。前人的研究表明，前缝后槽机匣处理可以在均匀来流条件下拓宽压气机的失速裕度19.79%。为了进一步评估其在畸变条件下的扩稳能力，选取畸变强度分别为0.90%、4.12%和24.75%的三种周向总压畸变来流进行了实验。结果表明，在三种强度畸变条件下，压气机的失速裕度分别下降了7.87%、9.19%和39.08%。在上述三种畸变条件下施加前缝后槽机匣处理能够拓宽压气机的失速裕度达18.48%、17.81%和13.80%。这些结果证实了前缝后槽机匣处理在畸变条件下仍然有效。通过机匣壁面布置的动态压力传感器测量表明，在均匀来流和周向畸变条件下压气机的失速先兆始终是突尖波，这是前缝后槽机匣处理扩稳效果明显的原因。功率谱密度分析结果表明，在同一流量点，施加前缝后槽机匣处理可以抑制旋转失速频带附近出现的扰动，从而推迟失速发生。失速先兆的分析结果表明，光壁条件下压气机的失速先兆均为短尺度突尖波（占据5-6叶片通道），施加前缝后槽机匣处理后压气机的失速先兆尺度变大。在0-4.12%的畸变强度下，失速先兆的尺度约占据10-12个叶片通道。随着畸变强度进一步增加到24.75%，失速先兆的尺度增加到占据16-17个叶片通道。这一现象可以对未来采用机匣处理压气机的失速预警研究提供参考。

关键词： casing treatment; circumferential distortion; stall precursor; axial compressor

本文引用格式

LI Yihan, LI Jichao, YANG Chen, DU Juan, ZHANG Hongwu, NIE Chaoqun . Hybrid Slot-Groove Casing Treatment for Stall Margin Improvement on an Axial Flow Compressor with Circumferential Total Pressure Distortion[J]. 热科学学报, 2023 , 32(2) : 770 -785 . DOI: 10.1007/s11630-023-1750-x

Abstract

The hybrid slot-groove (S-G) casing treatment (CT), which combines the advantages of slot and groove in consideration of stall margin enhancing and efficiency penalty, was experimentally investigated under circumferential distorted inflows. Previous experiments showed that the hybrid S-G CT can extend the stability by 19.79% with uniform inflow condition. To further estimate its stability enhancement ability with distorted inflow, three types of circumferential total pressure distortion inflow that the distorted intensities (DC(60)) are equal to 0.90%, 4.12%, and 24.75%, are selected to conduct a serial of experiments. Results demonstrated that the stability of the compressor were deteriorated by 7.87%, 9.19% and 39.08% respectively under three distorted inflows. It was founded that, under the above-mentioned distorted inflows, the hybrid S-G CT was able to extend the stability by 18.48%, 17.81%, and 13.80%, respectively, which proved the strong anti-distortion ability of the hybrid S-G CT. By using the dynamic pressure sensors fixed on the casing wall, the unsteady measurements demonstrated that the stall precursor with uniform and circumferential distorted inflows are always spiky-wave; thus the hybrid S-G CT can play an excellent stability enhancement capability. The analytical results with power spectral density proved that, when at the same flow point, the perturbation, with frequency being around the rotating stall frequency band, was distinctly suppressed by hybrid S-G CT, thus delaying the rotating stall. The stall precursor detected in the casing wall depicted that unlike the short length-scale of stall precursor (5–6 blade passage) under smooth casing; the hybrid S-G CT can create a stall precursor with long length-scale. Under the distortion intensities from 0 to 4.12%, the length scale of the stall precursors occupies approximately 10–12 blade passages. As the distortion intensity further increases to 24.75%, the length scale of stall precursor increases to occupy 16–17 blade passages. This phenomenon can guide the stall warning studies with compressors using CT in the future.

Key words： casing treatment; circumferential distortion; stall precursor; axial compressor

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